'use strict';

module.exports = (options) => {
  const fs = require('fs');
  const chalk = require('react-dev-utils/chalk');
  const webpack = require('webpack');
  const WebpackDevServer = require('webpack-dev-server');
  const clearConsole = require('react-dev-utils/clearConsole');
  const checkRequiredFiles = require('react-dev-utils/checkRequiredFiles');
  const {
    choosePort,
    createCompiler,
    prepareProxy,
    prepareUrls,
  } = require('react-dev-utils/WebpackDevServerUtils');
  const openBrowser = require('react-dev-utils/openBrowser');
  const semver = require('semver');
  const paths = require('../config/paths');
  const configFactory = require('../config/webpack.config');
  const createDevServerConfig = require('../config/webpackDevServer.config');
  const getClientEnvironment = require('../config/env');
  const react = require(require.resolve('react', { paths: [paths.appPath] }));

  const env = getClientEnvironment(paths.publicUrlOrPath.slice(0, -1));
  const useYarn = fs.existsSync(paths.yarnLockFile);
  const isInteractive = process.stdout.isTTY;

  // We require that you explicitly set browsers and do not fall back to
  // browserslist defaults.
  const { checkBrowsers } = require('react-dev-utils/browsersHelper');

  // Warn and crash if required files are missing
  if (!checkRequiredFiles([paths.appHtml, paths.appIndexJs])) {
    process.exit(1);
  }
  // Tools like Cloud9 rely on this.
  const DEFAULT_PORT = parseInt(process.env.PORT, 10) || options.port || 3000;
  const HOST = process.env.HOST || options.host || '0.0.0.0';

  if (process.env.HOST) {
    console.log(
      chalk.cyan(
        `Attempting to bind to HOST environment variable: ${chalk.yellow(
          chalk.bold(process.env.HOST)
        )}`
      )
    );
    console.log(
      `If this was unintentional, check that you haven't mistakenly set it in your shell.`
    );
    console.log(
      `Learn more here: ${chalk.yellow('https://cra.link/advanced-config')}`
    );
    console.log();
  }
  checkBrowsers(paths.appPath, isInteractive)
    .then(() => {
      // We attempt to use the default port but if it is busy, we offer the user to
      // run on a different port. `choosePort()` Promise resolves to the next free port.
      return choosePort(HOST, DEFAULT_PORT);
    })
    .then(port => {
      if (port == null) {
        // We have not found a port.
        return;
      }

      const config = configFactory('development', options.otherWebpackConfig);
      const protocol = process.env.HTTPS === 'true' ? 'https' : 'http';
      const appName = require(paths.appPackageJson).name;

      const useTypeScript = fs.existsSync(paths.appTsConfig);
      const tscCompileOnError = process.env.TSC_COMPILE_ON_ERROR === 'true';
      const urls = prepareUrls(
        protocol,
        HOST,
        port,
        paths.publicUrlOrPath.slice(0, -1)
      );
      const devSocket = {
        warnings: warnings =>
          devServer.sockWrite(devServer.sockets, 'warnings', warnings),
        errors: errors =>
          devServer.sockWrite(devServer.sockets, 'errors', errors),
      };
      // Create a webpack compiler that is configured with custom messages.
      const compiler = createCompiler({
        appName,
        config,
        devSocket,
        urls,
        useYarn,
        useTypeScript,
        tscCompileOnError,
        webpack,
      });
      // Load proxy config
      const proxySetting = require(paths.appPackageJson).proxy;
      const proxyConfig = prepareProxy(
        proxySetting,
        paths.appPublic,
        paths.publicUrlOrPath
      );
      // Serve webpack assets generated by the compiler over a web server.
      const serverConfig = createDevServerConfig(
        proxyConfig,
        urls.lanUrlForConfig
      );
      const devServer = new WebpackDevServer(compiler, serverConfig);
      // Launch WebpackDevServer.
      devServer.listen(port, HOST, err => {
        if (err) {
          return console.log(err);
        }
        if (isInteractive) {
          clearConsole();
        }

        if (env.raw.FAST_REFRESH && semver.lt(react.version, '16.10.0')) {
          console.log(
            chalk.yellow(
              `Fast Refresh requires React 16.10 or higher. You are using React ${react.version}.`
            )
          );
        }

        console.log(chalk.cyan('Starting the development server...\n'));
        openBrowser(urls.localUrlForBrowser);
      });

      ['SIGINT', 'SIGTERM'].forEach(function (sig) {
        process.on(sig, function () {
          devServer.close();
          process.exit();
        });
      });

      if (process.env.CI !== 'true') {
        // Gracefully exit when stdin ends
        process.stdin.on('end', function () {
          devServer.close();
          process.exit();
        });
      }
    })
    .catch(err => {
      if (err && err.message) {
        console.log(err.message);
      }
      process.exit(1);
    });
}